Tool-holder for lathes



' (No Model.)

W. C. HUMAN. TOOL HOLDER POR LATHBS.

No. 484,317.. Patented 001. 11, 1892.

'mi norma versus co., moro-1.1m, summum. n. c.'

1 UNITED STATES PATENT OEEICE.

WILLIAM C. HOMAN, OF MERIDEN, ASSIGNOR TO THE HENDEY MACHINE COMPANY, OF TORRINGTON, CONNECTICUT.

TOOL-HOLDER FOR' LATHES.

SPECIFICATION forming peut of Letters Patent No. 484,317, dated October 11,1892

Application filed April 4. 1892. Serial No. 42 '7.670. (No model.)

Figure 1, a plan View of the longitudinal carriage of an engine lathe, showing a top view of the improved tool-post arranged there- I5 on with the tool in position for longitudinal cutting; Fig. 2, the same as in Fig. l, with the tool-post adjusted for transverse cutting; Fig. 3, a vertical central section cutting on line a: of Fig. l; Fig. 4, a top view of the socket and turn-table, the tool-post removed; Fig. 5, a transverse section cutting on line y y of Fig. -1; Fig. 6, a transverse section cutting on line :c as of Fig. 5; Fig. 7, a side view of the turn-table and socket detached; Fig. 8, a Inodication in the construction of the socket.

This invention relates to lan improvement in the device for carrying the cutting-tool in engine-lathes, commonly called the toolpost, the invention having for its object to give a support for the tool ata point as near the cutting-edge as possible, and also -the ready adjustment of the tool, both as to angular and vertical position, and also to permit the removal of the tool from the lathe while-at work and replace itwith certainty that the tool wlll stand in the same position when so replaced as it did when removed and the inventior. consists inthe construction as hereinafter described, and particularly recited in the claims.

A represents the longitudinally-slidi ng carriage, adapted to move on the shears of the lathe in the usual manner. The carriage is constructed with transverse guides B, on which the transverselymovable carriage C is arranged in the usual manner and moved transversely by means of a leading-screw D in the usual manner. On the transverse carriage C the tool-post socket E is arranged. This socket is Vin the form of a vertical tube projecting upward from a turn-table F, to

which the socket is attached or made as an integral part thereof. The carriage C is constructed with a circular undercut groove G, concentric with the turn-table F, and through the turn-table bolts H II are arranged, the headsI of the bolts standing in the concentric groove G in the carriage, the bolts eX- tending up through the turn-table and provided wth nuts J, so that the nuts being turned hard down upon the turn-table F will secure the turn-table firmly to the carriage, so that it will partake of the movementv of that carriage, whether it be transversely across the principal carriage A or longitudinal with that principal carriage. The turn-table is preferably constructed on the under side with a circular rib K, (see Fig. 5, and as indicated in broken lines, Figs. 4 and 6,) which sets into the open circular groove in the carriage C, as seen in Fig. 5,'which serves to support the turn-table on the carriage C against radial movement, and independent of the bolts by which the turn-table is secured to the carriage. By loosening the nuts J the turn-table is rotatable in a horizontal plane on the carriage C and set at any desired position. The tubular socket E is arranged eccentric to the turn-table F, as seen in Fig. 6.

The tubular socket E is divided vertically, as at L, and the socket is separated from the turn-table from the divided side rearward. leaving a connection between the socket and the turn-table at the rear side M, Fig. 7. The

larger portion of the socket from the slit bel ing thus free, the socket is adapted to expand or contract to a limited extent. At the joint the socket is constructed with ears N N upon opposite sides, and through these ears a screw O is introduced, threaded into one of the ears, 9o and so that by ,means of the screw the two. edges of the socket at the division may be drawn together, so as to contract the diameter of the socket to some extent, or by withdrawing the screw to permit the expansion of the socket. y

P represents the tool-post, which is of cylindrical shape and corresponds in diameter, substantially, to the internal diameter of the socket E and so that it maybe set therein Ioo and free to be moved up or down, and when the post P is set into the socket the post may ble F, and that such adjustment ofthe posi may be made, the post is constructed withivvo` be clamped by means of the clamping-screw O, so as to be firmly held in the socket. The post may be adjusted up or down in the socket to any desired elevation Within thc range of its length, and when so adjusted the clamping-screw is applied to firmly secure the post in that position. To prevent therotation of the tool-post in its socket, afeatheror spline Q is arranged vertically in the socket and the post is correspondingly grooved, S0 that while the post may be moved up o-rdown its rotation independent of the socket is prevented.

Verticallythrough the post is an. opening R, but eccentric tothe post. The eccc-ntlif-y of the opening R to the post is equal to the eccentricity of the post to the turn-table and so'that when the post is set into the ,socket with the shorter radius of the eccentric ope-ning R in line with the shorter radius of the eccentric socket, as seen in Fig. 6,A the opening Rin the post is near .one side of the Now if the post be withdrawn from the socket and turned one-halfaround and set p socket.

again into the socket, as indicated broken lines, Fig. 6, the opening R will be brought" into position concentric with the turn-tagrooves corresponding to the spl-inattivo said two grooves being diametrically opposite each other and at right angles to a diametrical line centrally through the post and through the opening R, as seen in Figc, S represenbing the second groove opposite/'the spline Q. The post P is constructed withy an Vannular projecting liange T at its upper. end .of .Substantially the same .diameter asthe' upper end of the socket, and through this filangeis a vertical adj listing-screw U, which is .ad apted be employed `to give it the required elevation.

to bear upon the upperend of the; socketor,

, as here represented,.upon the upper end; off the spline and sopthat by turning* the screw' thepost may be adjusted up ordown., as occasion requires, it being u-nderstoodvthatt usually thek clamp of the socket upon-thepost j i will be relieved forsuch vertical adjustment.

Through the vertical openngRof the post; the tool-clamp spindle V is arranged. 'lfhisj` spindle is of cylindrical shape and* is introend of the post, and the lowerendof thespindle V is constructed with a headW to takefaf bearing against the Vlower endV of the posit.`

Through a spindle V a diametrical opening X is formed, through which the tool Y may pass, as usual in tool-holders, andvthespi-ndle is provided through its upper end with a screw Z, by which the tool may be claSped.`

the inner end of the` tool may rest directly upon the post, and thereby give so firm a support to the tool that it cannot by any. possibility yield under the force produced 1n cutting. The rigid support of the tool when near its cutting-point insuresmore perfect work l from the tool than can be produced where the It frequentlyv occurs that it is desir- For such of the socket upon the tool-post is relieved clam ping-spindle, may be withdrawn without .possible change of Vthe tool with relation to 'and the tool thus returned must nnavoidably find the identical position which it occupied before i-tsremoval. It atany ,time itis desirable to bring the tool-holder concentric with the turn-table, the post is withdrawn from the socket and turned one-half around, as represen-ted in broken lines, Fig. 6,: which brings the tool-holder into a positionconcentric with the turn-table. To adjust thetool to differentan-g-,les with relationtothe post, the toolhold'j-ng spindle maybe turned to the right or left without movementofy the post or turntable and, as indicated inbroken lines, Fig.

2, the post permits the-.adjustment of the; tool to any desired position., In setting the tool `the vertical adjusting-screw U will While prefer to construct the toobpost socket as a clamp, son that the post may be securelyheld within the socket, the socket maybe made .sol-id, ,as seen in Fig, 8,an,da

`and so that the'post, with the tool and its IOO IIO

setscreiw initroducedthrough one side to -bear upon the` toolfposiuso as to4 secure it in its position `whenI adjusted.

adjustable in said socket, the tool-post constructed with a vertical opening eccentric to the axis of said socket and post, with a toolclamping spindle through said opening in the While I prefer to provide.y the socket and i the post witha vertical spline to prevent ro'- duced through the opening Rfrom the lower post, and means, 'substantially such as dethrough the post, but eccentric to the axis of the post, and a tool-clamping spindle through said opening in the post, substantially as and for the purpose described.

3. The combination of the transverselymovable carriage of vanv engine-lathe with a turn-table arranged upon said carriage and so as to be rotatably adjustable in a horizontal plane, a vertical tubular socket on said turn-table, the axis vof the socket being eccentric to the aXis on which the turn-tablerotates, a cylindrical post arranged in the said socket, a spline and groove between said post and socket, whereby the said post is movable vertically, but prevented from rotation in the socket, 'the post constructed with a vertical opening through it, and means, substantially such as described, for clamping the post in the socket, substantially as and for the purpose described.

In testimony whereof I have signed this specification in the presence of two subscribf ing witnesses.

WILLIAM C. HOMAN.

Witnesses:

CHAs. E. HoMAN, ALFRED DUNLOP.y 

